Mapped strings problem

#1

Please give a hint for this problem. Do we have to use HashMap here ?

#2

@tishachhabra2702_8fc5a68a2e295e35 in mapped strings problem, it is given that there is a map which stores numbers from 1 to 26 which are correspondingly mapped from A to Z.
1 -> A
2 -> B
3 -> C
.
.
25 -> Y
26 -> Z

Now you have to print all the possible strings which we can form from given input number.
For eg.
input : 123
Now, the different ways in which we can divide string 123 are:
1-2-3 => A-B-C
1-23 => A-W
12-3 => L-C
the hint is that in the recursive call n/10 or something similar to this will be passed.

#4

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